Analyzing Rate of Change: Function Table from (-1,3) to (17,18)

Rate of Change with Function Tables

Given a table showing points on the graph of a function, determine whether or not the rate of change is uniform.

XY-151117381318

❤️ Continue Your Math Journey!

We have hundreds of course questions with personalized recommendations + Account 100% premium

Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:15 Let's figure out if the rate of change is the same throughout.
00:23 We notice that the difference in X, the horizontal values, remains constant.
00:35 Similarly, the difference in Y, the vertical values, stays the same.
00:41 So, we can conclude that the rate of change is indeed uniform.
00:46 And that's how we solve this problem. Great job!

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Given a table showing points on the graph of a function, determine whether or not the rate of change is uniform.

XY-151117381318

2

Step-by-step solution

To solve the problem, let's determine whether the rate of change between each pair of consecutive points is consistent:

First, calculate the rate of change between the first and second points, (1,3)(5,8)(-1, 3) \rightarrow (5, 8):

ΔYΔX=835(1)=56\frac{\Delta Y}{\Delta X} = \frac{8 - 3}{5 - (-1)} = \frac{5}{6} .

Next, calculate the rate of change between the second and third points, (5,8)(11,13)(5, 8) \rightarrow (11, 13):

ΔYΔX=138115=56\frac{\Delta Y}{\Delta X} = \frac{13 - 8}{11 - 5} = \frac{5}{6} .

Finally, calculate the rate of change between the third and fourth points, (11,13)(17,18)(11, 13) \rightarrow (17, 18):

ΔYΔX=18131711=56\frac{\Delta Y}{\Delta X} = \frac{18 - 13}{17 - 11} = \frac{5}{6} .

All calculated rates of change are 56\frac{5}{6}, indicating a constant rate of change.

Therefore, the rate of change is uniform.

3

Final Answer

Uniform

Key Points to Remember

Essential concepts to master this topic
  • Definition: Rate of change equals change in y over change in x
  • Calculation: Use ΔYΔX=835(1)=56 \frac{\Delta Y}{\Delta X} = \frac{8-3}{5-(-1)} = \frac{5}{6}
  • Verification: Check all consecutive pairs have identical rates: 56=56=56 \frac{5}{6} = \frac{5}{6} = \frac{5}{6}

Common Mistakes

Avoid these frequent errors
  • Calculating rate of change incorrectly by switching numerator and denominator
    Don't calculate ΔXΔY=65 \frac{\Delta X}{\Delta Y} = \frac{6}{5} instead of ΔYΔX=56 \frac{\Delta Y}{\Delta X} = \frac{5}{6} ! This gives the reciprocal and wrong comparison values. Always put change in y on top and change in x on bottom.

Practice Quiz

Test your knowledge with interactive questions

Look at the graph below and determine whether the function's rate of change is constant or not:

–5–5–5–4–4–4–3–3–3–2–2–2–1–1–1111222333444555666777888999101010111111–3–3–3–2–2–2–1–1–1111222333444555000

FAQ

Everything you need to know about this question

What does uniform rate of change actually mean?

+

A uniform rate of change means the function increases (or decreases) by the same amount for every equal step in x-values. It's like climbing stairs with equal step heights!

Do I need to check every pair of points?

+

Yes! You must calculate the rate between all consecutive pairs. If even one pair has a different rate, the change is non-uniform.

What if I get different rates for different pairs?

+

Then the rate of change is non-uniform! This means the function could be quadratic, exponential, or another non-linear type.

Why is the rate 56 \frac{5}{6} for all pairs in this problem?

+

Each x-value increases by 6: (-1→5), (5→11), (11→17), and each y-value increases by 5: (3→8), (8→13), (13→18). So every rate is 56 \frac{5}{6} !

How can I tell if a function table shows a linear relationship?

+

If the rate of change is uniform (constant), the function is linear! Non-uniform rates indicate non-linear functions like parabolas or curves.

🌟 Unlock Your Math Potential

Get unlimited access to all 18 Functions questions, detailed video solutions, and personalized progress tracking.

📹

Unlimited Video Solutions

Step-by-step explanations for every problem

📊

Progress Analytics

Track your mastery across all topics

🚫

Ad-Free Learning

Focus on math without distractions

No credit card required • Cancel anytime

More Questions

Click on any question to see the complete solution with step-by-step explanations